(navigation image)
Home American Libraries | Canadian Libraries | Universal Library | Community Texts | Project Gutenberg | Children's Library | Biodiversity Heritage Library | Additional Collections
Search: Advanced Search
Anonymous User (login or join us)
Upload
See other formats

Full text of "The Cambridge Natural History"

BONES   OF   HAND

169

•which these latter bones are connected with the sternum is
curiously like their mode of connexion with the spinal column at
their other end. With this may be possibly compared the double
articulation of the single rib (which articulates with the sternum)
in the Horquals. In Gycloturus this mode of articulation does
not occur.

The   manus   of   Myrmecophaga   is    five-fingered.      Of   these
the  third digit  (as in  Perissodactyles)  is   the   most   prominent;

FIG. 95.—A, Maims of Great Anteater (Myrmecopfooffa, fa&ata). x J. B» Manus of
Little Anteater (Gycloturus didactylus). x 2. c, Cuneiform ; I, lunar ; w, magnum ;
jp, pisiform ; $, scaphoid; tdt trayezoid ; im, trapezium ; nt imciform ; /- Vt digits.
(From. Flower's Osteology.)

it is at least double the width of the second or third finger; the
pollex is very slender. In the little Cyclotwrus this is carried to
a greater extent: the third digit is relatively enormous; the first
and the fourth have become quite rudimentary; while the fifth is
only just recognisable as a minute ossification.
The chevron-bones in the tail surround a well-developed rete
mirabile, a rete being found in precisely the same position in
the Eastern Mdnis. Tamandua has also retia, which are also
found In the Spider-monkeya
Cycloturus is by far the smallest of the Anteateia     It has